186 BrxiTiSH SEA-WEEDS. \Rho(losj)erme(B. 



logia Britannica/ where both plants are figured in PI. cxx. 

 It is found both at Saltcoats and Ardrossan. At the 

 former place the tufts are crowded, and nearly cover the 

 rocks near high- water mark. 



One is almost sorry, though he must own the justice and 

 propriety of it, that in Phyc. Brit. Call'ith amnion Rothii is 

 allowed to swallow up Callithamnion jiuTpureum of Harvey\ 

 Manual. It had a pleasant classical interest attached to it. 

 I have before me a Kttle scrap of it which accompanied the 

 following note from my kind friend Mr. Keddie of Glasgow. 

 — "Last time I was in lona, I made diligent search for 

 Conferva purpurea of M'CuUoch, the Bi/ssus purpurea of 

 Lightfoot, and the CallUhamnion purpureum of Harvey; 

 and w^as delighted to find it still growing where Lightfoot 

 and M'Culloch saw it, near the Abbot Mackinnon^s tomb. 

 It occurs in purple patches, staining the lower part of the 

 walls of the cathedral." It is also the Conferva purpurea of 

 Dillwyn, whose figure is not so good as that in Phyc. Brit. 



24. ^Callith AMNION SPARSUM, Harveij . 



Hab. On old stems of Laminaria saccliarina at Appin, 

 Capt. Carmichael; at Miltown Malbay, on Conferva rupes- 

 tris. 



Even more minute than the preceding. 



